Evaluate 3(a-4b) when a= -2 and b= 5

I believe the answer is -26 :) I hope this helps! ^_^

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.